close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3082017

код для вставки
March 19, 1963
I
R. J. BERNOTAS
-
3,032,047
TRACK ROLLER ASSEMBLY
Filed May 15, 1961
2 Sheets-Sheet 1
ooooooooooooooo
/” I
o
g +5
_
_
k4 '
o
_'.
°
_
o
.
'
’
INVENTOR.
March 19, 1963
‘
R. J. BERNOTAS
3,082,047
TRACK ROLLER ASSEMBLY
Filed May 15, 1961
2 Sheets-Sheet 2
, \
\\
, .
‘
N \/
\. ‘
\ .\Q§\\\\\ \ \
/ v/ \\v.|f.T
/
A74,’
United States Patent 0
3,082,047
ICC
Patented Mar. 19, 1963
2
> 1
.
3,082,047
TRACK ROLLER ASSEMBLY
_
Ralph J. Bernotas, South Euclid, Ohio, assignor to Gen
eral Motors Corporation, Detroit, Mich., a corporation
of Delaware
Filed May 15, 1961, Ser. No. 109,890
14 Claims. (Cl. 308-211)
It is, therefore, a principal object and feature of this
invention to provide a roller assembly including bearing
means which may be accurately preloaded prior to in
stallation of the roller assembly, thereby insuring proper
preload of the bearing means without further attention
being given thereto upon installation of the roller assem
bly.
-
It is yet another object and feature of this invention
to provide a roller assembly including a roller body hav
This invention pertains to load-bearing support assem~
blies for rotatably mounted members and, in particular, 10 ing its opposite ends rotatably supported by bearing means
disposed between the ends of the roller body and support
to track roller assemblies for tracked vehicles.
members adapted to be or rigidly secured to suitable sup
ports, one bearing means being ?xed relative to its asso
ciated support member while the other bearing means is
ly extending track frames suitably connected to opposite
sides thereof and supporting the endless tracks of the ve 15 movable relative to its support member to accommodate
relative movement between the support members.
hicle. Each track frame includes laterally spaced longi
tudinally extending frame members or rails. A plurality
It is yet another object and feature of this invention, '
With speci?c reference to a live shaft track roller assem
of track roller assemblies are mounted in longitudinally
spaced relation along each track frame for rolling contact
bly for a tracked vehicle, to provide such an assembly
with the ground-engaging portion of the endless tracks 20 comprising a roller, an end cap or support member at each
end of the roller adapted to be rigidly secured to the re
of the vehicles, each roller assembly including a roller
spective frame members of each track frame of the ve
body rotatably supported from end caps or support mem
bers at the opposite ends thereof which are rigidly secured
hicle, load bearing ‘assemblies disposed between and ro
tatably supporting each end of the roller Within its asso
to respective frame members of the track frame.
As will be readily apparent to those acquainted with
ciated end cap or support member, and means for ad
justing the bearing assemblies axially relative to each
this art, the track roller assemblies of such vehicles are
Tracked vehicles, such as crawler tractors, conven
tionally comprise a main tractor chassis and longitudinal
subjected repeatedly to extreme loads both axially and
radially thereof, and particular attention must be given to
the bearing assemblies which mount such rollers on their
other toadjust the preload on the bearing assemblies
prior to installation of the roller assembly on the track
Vehicle.
It is yet another object and feature of this invention
respective end caps or support members. Thus, and re 30
ferring by way of example to a live shaft roller assembly
to provide a live shaft track roller of the type aforemen
tioned which may not only be preloaded prior to installa
which includes aligned stub axle shafts rotatably mounted
by suitable bearing assemblies on the respective roller
tion on the tractor, but which further includes a bearing
assembly at one end of the roller'which is movably
support members, particular care must be taken in prop
mounted relative to its associated end cap to compensate
erly preloading the bearing assemblies thereof to insure
optimum transfer of loads from the roller to the track
for relative flexure of the frame members of each track
frame and otherwise obtain a substantial period of trouble
frame when the roller is installed thereon, thereby pre
venting extreme variations in the loadings ‘of both bearing
free operation from the roller assemblies.
V Consequently, in installing such roller assemblies on
assemblies.
>
,
In general, these and other objects of the invention are
attained in a track roller assembly comprising a roller in
the track frame, whether at the factory or in the ?eld, it
has been conventional practice to utilize shim members in
mounting the respective end caps or roller support mem
bers to the respective frame members of each track frame,
projecting axially from opposite ends or sides of the roller
the shims being utilized to properly position the support
so as to be received respectively within end caps or sup
cluding axially aligned axle shafts rigidly secured to and‘
members axially relative to each other to provide the de 45 port members. A roller bearing assembly surrounding
ly engages and rotatably'supports each axle shaft within
sired predetermined preload in the bearing assemblies.
its associated end cap or support housing. The ‘inner and
As will be apparent, such an installation procedure often
involves gaging and regaging the preload and addition and
outer races of one of the bearing assemblies are respec
tively secured to one shaft and its associated end cap,
removal of the shims at one or the otherroller support
while the inner race of the other bearing assembly is rig
members toobtain the desired preload. Needless to say,
such a procedure is not very desirable in view of mass pro
duction techniques. However, and more importantly, such
a ‘procedure has been found to result in relatively great
variation in the preload of the bearings of the roller as
semblies on successive tractors coming from the same as~
, idly secured to the other shaft and the outer race thereof
is axially slidably mounted within the other end cap. A
bearing cage is axially slidably disposed within this other
end cap and engages the outer race of the'bearing assem
bly therein so as to retain the latter. A rigid bolt ex
tends between and interconnects the aforementioned cage
and the oppositely located end cap on an axis coincident
with the axis of rotation of the roller, and a nut is thread
ably adjustable on one end of the bolt to accomplish axial
tenance personnel who either lack the requisite experience
or necessary equipment possessed by manufacturing per 60 adjustment of the cage and opposite end cap relative to
each other. As a consequence of this construction, the
sonnel, or both, resulting in assembled track rollers having
respective bearings may be adjusted axially relative to
too loose or too tight a preload in their bearings.
sembly line. Furthermore, the same problem is present
ed in the- ?eld and is accentuated when it is considered
that such roller assemblies-are often replaced by main
Furthermore, even if the roller-supporting ‘bearings are
each other thereby preloading the bearing assemblies.
Therefore, track roller assemblies including roller assem
blies sold for the replacement marketpmay be benched pre
the track roller frame cause some relative bending or flex
loaded at the factory and irrespective of installation at the
ure of the respective frame members thereof thereby ad
factory or in the ?eld such roller assemblies may be,
versely affecting bearing loading; that is, these frame mem
mounted on the track frame of the vehicle merely by bolt
bers of each track frame and the end caps or roller sup
ing or otherwise rigidly securing the end caps to the frame
port members connected thereto have a tendency to move
axially toward or away from each other resulting in sub 70 members of each track frame without further attention
properly preloaded, the rather severe forces imposed on
stantial undesired changes in the loadings of the roller
being given to the loading of the bearings. Finally, since
supporting bearing assemblies.
the one end of the shaft including the bearing cage is
3,082,047
3
4
axially slidably mounted within its associated end cap,
relative ?exure or bending of the track frame resulting in
cage 40 are free to move axially relative to the end cap
26. Suitable seal means indicated generally at 42 are
relative axial movement of the end caps will not affect to
interposed between the open end of each end cap and
an undesired degree loading of the hearing.
its associated axle shaft, a cavity 44 being provided be
The objects of the invention and the manner in which
they are attained will become more apparent hereinafter
as the description of the invention proceeds, and in which
reference is made to the drawings in which:
FIGURE 1 is a side elevational view of a crawler trac
tween the end of each axle shaft and its associated end
' cap and adapted to be charged with a lubricant for the re
spective bearing assemblies.
A rigid bolt 46 extends axially through the roller 20
and axle shafts 22 and 24 coincident with the axis
tor equipped with a preferred embodiment of the inven 10 of rotation of the latter and includes a head 48 at one
end thereof engaged with the exterior surface of end cap
tion;
FIGURE 2 is an enlarged fragmentary view of a por
28 and is threaded at the other end thereof to receive
tion of FIGURE 1; and
an adjustable nut 50 engaged with the exterior surface
FIGURE 3 is an enlarged view taken on line 3-3 of
of the cage 40. A threaded plug 52 closes an opening
FIGURE 1.
15 in end cap 26 through which access may be had to nut 50.
At this juncture, and as will become more fully appar
It will now be apparent that, in initially assembling the
ent hereinafter, the present invention may be usefully em
track roller 20, bearing assemblies 30 and 32 and the
ployed in many environments. However, for the pur
respective end caps 26 and 28 as shown in FIGURE 3,
pose of illustrating and describing a preferred embodi
the bolt 46 is passed between the bearing cage 40 and
ment thereof, the drawings show and the following de~ 20 the end cap 28 and nut 50 is adjusted to draw such
scription is directed to a particular preferred use of the
cage and end cap axially toward each other to preload
invention in conjunction with a crawler type vehicle.
the bearing assembly, suitable gages and other devices be
Referring now to FIGURE 1 of the drawings, the
ing employed as required for this purpose. Thereafter,
crawler tractor 2 comprises the usual longitudinally ex
such assembled track rollers may be installed on a tractor
tending track frame 4 on each side thereof, only that 25 at the factory or in the ?eld without need for further at
frame on the left side of the vehicle ‘being shown, each
tention to such preload. Thus, the end cap 26 is mounted
track frame including rigidly interconnected laterally
about axel shaft 22 and the respective end caps or sup
spaced longitudinally extending frame members or rails
port structures 26 and 28 are ‘suitably rigidly secured as
6 and 8 (FIGURE 3). An idler wheel 10 is mounted
by fasteners 54 (FIGURE 2) to the respective frame
at the forward end of each track frame, while a driving
members 6 and 8 of each track frame 4 so as to dispose
sprocket wheel 12 is mountedat the rear of the tractor
the rollers transversely between such frame members in
and extends into substantial alignment with each of the
engagement with the ground-engaging portion 116 of each
respective track frames. A ground-engaging endless
track. While the end caps may be so secured in any
track 14 is entrained about the idler and sprocket wheels
suitable manner, preferably they are secured in down
of each track frame, and the sprocket wheels are driven 35 wardly opening semi-circular recesses in the track frames
to propel the vehicle in a manner well known in this art.
in the manner and for the purpose more fully described
Inasmuch as the details ‘of such a tractor vehicle form
in United States Patent No. 2,823,079, entitled “Track
no part of the present invention and are Well known
Roller Assembly,” and granted to R. C. Williams on
in the art, further description of such details is deemed
February 11, 1958.
to be unnecessary. The ground-engaging portion 16 of 40
Finally, it will be noted that the aforedescribed con
each endless track intermediate the idler and sprocket
struction avoids the imposition of substantial undesired
wheels is engaged and supported by a plurality of live
changes in the loading of the bearing assemblies 30 and
shaft track roller assemblies indicated generally at 18
32. Thus, as the track roller frames bend or ?ex in re
and spaced longitudinally of each track frame 4.
sponse to the relatively severe forces imposed thereon,
Each roller assembly 18 comprises a roller body 20
the track frame members 6 and 8 will likewise ?ex rela
having its periphery suitably ?anged as indicated in FIG
tive to each other. However, since the bearing assembly
URE 3 so as to engage and guide the track links of the
endles track in a manner well known in the art. Axially
aligned stub axle shafts 22 and 24 are formed integral
with or otherwise rigidly secured to opposite end faces
of the roller body 20 and project axially therefrom. Each
of these axle shafts projects into a respective hollow cyl
indrical end cap, housing or support 26 and 28, and anti
friction roller bearing assemblies 30 and 32 are respec
tively mounted between each axle shaft and its associ
ated end cap. in order to rotatably support the roller body
about the axis of the axle shafts. Each of the bearing
30 may “?oat” axially relative to the bore of the end cap
26, relative axial inward or outward movement of the
end caps occasioned by relative ?exure of the frame mem~
bers 6 and 8 will have a relatively slight effect, if any, on
the predetermined loadings of the bearing assemblies since
the latter are con?ned between cage 40. and end cap 28
which are ?xed relative to each other.
While but one form of the invention has been shown
and described, other forms will now be apparent to those
skilled in the art. Therefore, the embodiment shown on
the drawing is merely for illustrative purposes, and is
assemblies 30 and 32 comprises an annular inner race 34
and an oppositely disposed annular outer race 36 between
not intended to limit the scope of the invention which is
de?ned by the claims which follow.
which there are disposed a plurality of circumferentially 60
I claim:
spaced anti-friction roller bearing elements which, in this
case, are barrel type roller bearing elements 38. Each of
the bearing assemblies is adapted to absorb and transfer
1. A roller assembly comprising a roller including
axially aligned axle shafts rigidly secured thereto and
projecting from opposite ends thereof, a support member
for each of said shafts, bearing means disposed between
thereof as will be apparent to those skilled in the art.
65 each of said support members and a respective shaft and
The inner race 34 of each bearing assembly is suitably
rotatably supporting the latter, one of said bearing means
rigidly secured as by press-?tting about the extreme outer
being ?xed axially relative to one of said support mem~
end of a respective axle shaft, while the outer race 36 of
bers, the other of said bearing means being movable axial
the bearing assembly 32 is similarly secured Within its
ly relative to the other of said support members, and
associated end cap or housing 28. A bearing cage 40 70 means for adjusting said other bearing means axially rela
is disposed within the end cap 26 and engages the axially
tive to said one support member and independently of
outer end of the outer race of the bearing assembly 30
said other support member to preload said bearing as
so as to retain the latter in operative relation with its
semblies.
associated inner race and bearing elements. Both the
2. A roller assembly comprising a roller including axi
outer race of the bearing assembly 30 and its supporting
ally aligned axle shafts rigidly secured thereto and pro
loads imposed on the roller both radially and axially
3,082,047 ’
>
6
5
tween, said inner races being respectively secured about
jecting from opposite ends thereof, a support member
‘for one of said shafts, bearing means disposed between
said shafts, the outer race of said ?rst bearing assembly
being secured within one of said end caps and the outer
said support member and said one shaft and rotatably
supporting the latter, a bearing cage for the other of said
race of said second bearing assembly being axially slid
shafts, bearing means disposed between said bearing cage
and said other shaft and rotatably supporting the latter,
axially adjustable means connecting said cage and said
support member to position them ‘axially relatively to
' ably mounted within the other of said end caps, a bearing
assemblies including inner and outer annular races hav
a track frame to rotatably support the roller on the latter.
cage axially slidably mounted within said other end cap
and retaining the outer race of said second bearing assem
bly, and axially adjustable means connecting said cage
and said one end cap to position them axially relative to
' each other to preload said bearing means, and a support
member axially slidably supporting said other shaft and 10 each other to preload said bearing ‘assemblies.
_ 8. A track roller assembly adapted to be mounted on a
its associated bearing means.
track frame of a tracked vehicle comprising a track roller,
3. A live shaft track roller assembly comprising a roller
axially aligned axle shafts rigidly secured to and project
including axially aligned axle shafts rigidly secured there
ing from opposite ends of said roller, a bearing assembly
to and extending from the opposite ends thereof, a sup
port member for each of said shafts, a bearing assembly 15 rotatably supporting each of said shafts, each of said
assemblies including inner and outer annular races hav
disposed between each of said support members and a
ing a plurality of anti-friction load bearing elements dis—
respective shaft and rotatably supporting the latter, a
posed therebetween, said inner race of each bearing assem
bearing cage for the bearing assembly for one of said‘
bly being secured about a respective shaft, an end cap
shafts, said cage and said one shaft including the bearing
assembly disposed therebetween being movable axially 20 receiving and supporting one of said shafts, the outer
race of the bearing assembly for said one shaft being
relative to one of said support members, and axially
secured in said end cap, a bearing cage 1at the end of the
adjustable means connecting said cage and the other of
other ‘shaft, the router race of the bearing assembly for said
said support members to position them axially relative to
other shaft being retained by said cage, axially adjustable
each other to preload said bearing assemblies.
4. A roller assembly comprising a roller including axi 25 means connecting said cage and end cap to position them
axially relative to each other to preload said bearing
ally aligned axle shafts rigidly secured thereto and [pro
assemblies, an end cap receiving and supporting the other
jectin-g from opposite ends thereof, bearing means rotata- .
of said shafts, said last-named end cap and said other shaft
bly supporting each of said shafts, and end cap support
including its bearing assembly being free to move axially
ing one of said shafts and its bearing means, a bearing
relative to each other, and means for rigidly mounting
cage for retaining the bearing means for the other of said
said end caps on a track frame to support‘said roller on
shafts, axially adjustable means connecting said cage and
the latter.
end cap to position them axially relative to each other to
9. A live shaft track roller assembly adapted to be
preload said bearing means, and an end cap supporting the
mounted on the track frame of a tracked vehicle com—
other of said shafts, said last-named end cap and said
prising a roller including axially aligned axle shafts rigid
other shaft including its bearing means being free to move
ly secured thereto and extending from the opposite ends
axially relative to each other.
thereof, an end cap receiving each of said shafts, ?rst
5. A roller assembly comprising a roller including axi
and second bearing assemblies each including inner and
ally aligned axle shafts rigidly secured thereto and pro
outer bearing races and a plurality of anti-friction bearing
jecting from opposite ends thereof, bearing means rot-ata
bly supporting each of said shafts, an end cap support 40 elements disposed therebetween, said inner races being
respectively secured about said shafts, the outer race of
ing one of said shafts and its associated bearing means, a
said ?rst bearing assembly being secured within one of
bearing cage for retaining the ‘bearing means for the other
said end caps and the outer race of said second bearing
of said shafts, axially adjustable means including a bolt
assembly being axially slidably mounted within the other
extending axially between and connecting said cage and
end cap to position them axially relative to each other to 45 of said end caps, a bearing cage axially slidably mounted
within said other end cap and retaining the outer race of
preload said bearing means, and an end cap supporting the
said second bearing ‘assembly, axially ‘adjustable means
other of said shafts, said last-named end cap and said
including a bolt extending between and connecting said
other shaft including its bearing means being free to move
cage and said one end cap on an axis coincident with the
axially relative to each other.
6. A roller assembly comprising a roller including axi 50 axis of rotation of said roller, said means being axially
adjustable to position said cage and said one end cap
ally aligned axle shafts rigidly secured thereto ‘and pro
axially relative to each other to preload said bearing as~
je'cting from opposite ends thereof, a bearing assembly
semblies, and means for rigidly mounting said end caps to
rotatably supporting each of said shafts, each of said
10. In combination, a tracked vehicle including a track
ing a plurality of antifriction load bearing elements dis 55
frame having a pair of spaced frame members, a track
posed therebetween, said inner race of each bearing as
engaging roller assembly disposed between said frame
sembly being secured about a respective shaft, an end cap
members; said roller assembly comprising a pair of sup
receiving and supporting one of said shafts, the outer race
port members respectively rigidly secured to said frame
of the bearing assembly for said one shaft being secured
in said end cap, a bearing cage at the end of the other 60 members, a roller including axially aligned axle shafts
rigidly secured thereto and projecting from opposite ends
shaft, the outer race of the bearing ‘assembly for said
thereof, bearing means disposed between each of said
other shaft being retained by said cage, axially adjustable
support members and a respective shaft and rot-ata'bly
means connecting said cage and end cap to position them
supporting the latter, one of said bearing means being
axially relative to each other to preload said bearing
?xed axially relative to one of said support members, the
assemblies, and an end cap receiving and supporting the
other of said bearing means being axially movable rela
other of said shafts, said last-named end cap and said
other shaft including its bearing assembly being free to
tive to the other of said support members, and means for
adjusting said other bearing means and said one support
move axially relative to each other.
7. A roller assembly comprising a roller including axi 70 member axially relative to each other independently of
said other support member to preload said bearing as~
ally aligned axle shafts rigidly secured thereto and extend
semblies.
ing from the opposite ends thereof, an end cap receiving
‘ each of said shafts, ?rst and second bearing assemblies
each including inner and outer bearing races and a plu
rality of anti-friction bearing elements disposed therebe
11. In combination, a tracked vehicle including a track
frame having a pair of spaced frame members, a track
75
engaging roller assembly disposed between said frame
3,082,047
7
8
members; said roller assembly comprising a pair of sup
port members respectively rigidly secured to said ‘frame
members, a roller including axially aligned axle shafts
rigidly secured thereto and projecting 'from opposite
disposed within said other end cap and retaining the outer
race of said second bearing assembly, an axially adjustable
means including a bolt extending axially between and
ends thereof, bearing means disposed between each sup
port member and a respective shaft and rotatably sup
porting the latter, one of said bearing means being ?xed
axially relative to one of said support members, the other
of said bearing means being movable axially relative
connecting said one end cap to the said cage in said other
end cap to position them axially relative to each other
to preload said bearing assemblies.
13. A roller assembly comprising a roller, a support
member ‘for each end‘ of said roller, bearing means dis
posed between each of said support members and the re
to the other of said support members, a bearing cage for 10 spective end of said roller, one of said bearing means
being ?xed axially relative to one of said support mem
retaining the other of said bearing means, an axially ad
bers, the other of said bearing means being movable
justable means connecting said cage and said one sup
axially relative to the other of said support members, and
means for adjusting said other bearing means axially
12. 'In combination, a tracked vehicle including a 15 relative to said one support member and independently
of said other support member to preload said bearing
track ‘frame having a pair of spaced frame members, a
assemblies.
track-engaging roller assembly disposed between said
14. A roller assembly comprising a roller, a support
frame members; said roller assembly comprising a pair
member for each end of said roller, bearing means dis
of axially aligned end caps opening toward each other
and respectively rigidly secured to said frame members, 20 posed between said support member and one end of said
roller, a bearing cage for the other end of the roller,
a roller including axially aligned axle shafts rigidly se
bearing means disposed between the bearing cage and
cured thereto and projecting from opposite ends thereof
said other end of the roller, axially adjustable means
into a respective end cap, ?rst and second bearing assem
connecting. said cage and said support member to posi
blies respectively rotatably supporting said shafts within
said end caps and each including inner and outer bearing 25 tion them axially relatively to each other to preload said
bearing means, and a support membervaxially slidably
races and a plurality of anti-friction bearing elements dis
supporting said cage end of the roller.
posed therebetween, the inner races of said bearing as
port member to position them axially relative to each
other to preload said bearing assemblies.
semblies being secured about respective shafts, the outer
race of said ?rst bearing assembly being secured within
one of said end caps and the outer race of said second 30
bearing assembly being axially slidably disposed. within
the other of said end caps, a bearing cage axially slidably
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,690,933
2,880,041
Bechman ____________ __ Oct. 5, 1954
_Brownyer ____________ __ Mar. 31, 1959
Документ
Категория
Без категории
Просмотров
0
Размер файла
808 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа